Wiggle | Shimano Octalink Bottom Bracket | Bottom Brackets - Shimano 105 octalink bottom bracket
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Splined bottom bracket designed for use with Shimano road Octalink crankset. Oversize BB spindle - large 22mm diameter chrome-moly hollow pipe billet spindle reduces weight, increases strength and rigidity. Octalink splined axle/crank arm interface - results in a more rigid crank. The Shimano BB bottom bracket hasn't gone anywhere, even after such a long time. It is an Octalink bottom bracket (8xtoothing) with steel axle.